Yes, pretty insensitive. Your wife is obviously going through a tough time and she needs you to support her. I'm sure her family doesn't expect to be sobbing while you are there, seeing as though you didn't really know the woman. Plus, you being in a stable condition could probably help your wife a lot who's probably on an emotional roller coaster right now.

But watching a boxing match with your friends instead of being with your wife during a tought time is going to seem insensitive.